O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
National Radiator Company's No. 2 Oil-Fired Boiler
Here is an interesting presentation of extended heating surface in a boiler, featuring National Radiator Company's No. 2 Oil-Fired Boiler. Size matters. This is from 1941.
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